<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/HOME' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>产品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 顶部警告 -->
      <el-alert title="注意：只允许为第三极分类设置参数" type="warning" :closable="false" show-icon></el-alert>
      <!-- 选择商品分类 -->
      <el-row class="cat_opt">
        <el-col>
          <span>选择产品分类：</span>
          <!-- 级联选择框 -->
          <el-cascader
          expand-trigger="hover"
          v-model="selectCateKeys"
          :options="cataList"
          :props="cateProps"
          @change="handleChange">
          </el-cascader>
        </el-col>
      </el-row>
      <!-- tabs标签页 -->
      <el-tabs v-model="activeName" @tab-click="handTabsClick">
          <!-- 添加动态参数的面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加参数按钮 -->
          <el-button type="primary" size='mini' :disabled='isBtnDisabled' @click="addDialogVisible = true;inputFocus()" class="button">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- Tag标签 -->
                <el-tag v-for="(item, i) in  scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 添加新标签的输入框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column label="#" type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon='el-icon-edit' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon='el-icon-delete' @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
          <!-- 添加静态属性的面板 -->
        <el-tab-pane label="静态属性" name="only">
           <!-- 添加属性按钮 -->
          <el-button type="primary" size='mini'  :disabled='isBtnDisabled' @click="addDialogVisible = true;inputFocus()" class="button">添加参数</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <!-- Tag标签 -->
                <el-tag v-for="(item, i) in  scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                <!-- 添加新标签的输入框 -->
                <el-input
                class="input-new-tag"
                v-if="scope.row.inputVisible"
                v-model="scope.row.inputValue"
                ref="saveTagInput"
                size="small"
                @keyup.enter.native="handleInputConfirm(scope.row)"
                @blur="handleInputConfirm(scope.row)"
                >
                </el-input>
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index" label="#"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button size="mini" type="primary" icon='el-icon-edit' @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button size="mini" type="danger" icon='el-icon-delete' @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>

          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
    :title="'添加' + titleText"
    :visible.sync="addDialogVisible"
    width="50%"
    @closed="addDialogClosed">
      <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name" ref="inputRef"></el-input>
        </el-form-item>
      </el-form>
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </template>
    </el-dialog>

    <!-- 编辑对话框 -->
    <el-dialog
    :title="'修改' + titleText"
    :visible.sync="editDialogVisible"
    width="50%"
    @closed="editDialogClosed">
      <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRules">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name" ref="inputRef"></el-input>
        </el-form-item>
      </el-form>
      <template #footer>
        <span class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </template>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      //  商品分类列表
      cataList: [],
      //  级联选择框选中的数据
      selectCateKeys: [],
      //  级联选择框配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 被激活的标签页名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态参数的数据
      onlyTableData: [],
      // 控制添加对话框的显示
      addDialogVisible: false,
      // 编辑的对话框的显示
      editDialogVisible: false,
      // 添加对话框的绑定数据对象
      addForm: {},
      // 修改表单的数据对象
      editForm: {},
      // 对话框的添加表单验证规则
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      // 修改表单的验证规则
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.message.error('获取数据失败')
      this.cataList = res.data
      console.log(this.cataList)
    },
    //  级联选择框选中数据改变
    async handleChange () {
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData () {
      // 证明选中的不是三级分类
      if (this.selectCateKeys.length !== 3) {
        this.selectCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 根据所选id和标签页当前状态 发起请求
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.message.error('获取参数列表失败')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        // 控制按钮文本框显示
        item.inputVisible = false
        // 添加新标签的内容
        item.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // tabs标签页的点击事件处理函数
    handTabsClick () {
      this.getParamsData()
    },
    // 监听对话框关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击确定提交新的参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) return this.$message.error('获取数据失败')
        this.$message.success('获取参数成功')
        this.addDialogVisible = false
        this.getParamsData()
      })
    },
    inputFocus () {
      this.$nextTick(function () {
        // DOM 更新了
        this.$refs.inputRef.focus()
      })
    },
    // 展示修改对话框
    async showEditDialog (attrId) {
      // 查询要修改的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取数据失败')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 重置修改表单
    editDialogClosed () {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) return this.$message.error('修改参数数据失败')
        this.$message.success('修改参数数据成功')
        this.editDialogVisible = false
        this.getParamsData()
      })
    },
    removeParams (attrId) {
      this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async () => {
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
        if (res.meta.status !== 200) return this.$message.error('删除参数失败')
        this.$message.success('删除参数成功')
        this.getParamsData()
        this.$message({
          type: 'success',
          message: '删除成功!'
        })
      }).catch(() => {
        this.$message({
          type: 'info',
          message: '已取消删除'
        })
      })
    },
    // 添加标签文本框失去焦点或者点击回车出发函数
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 将对attr_vals的操作保存到数据库
    async saveAttrVals (row) {
      // 发起请求保存到数据库
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) return this.$message.error('修改参数失败')
      this.$message.success('修改参数成功')
    },
    // 点击按钮显示文本框
    showInput (row) {
      row.inputVisible = true
      // 文本框获得焦点
      // $nextTick 方法的作用: 当页面上元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除对应的参数标签
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    isBtnDisabled () {
      if (this.selectCateKeys.length !== 3) return true
      return false
    },
    // 当前选中的三级分类的id
    cateId () {
      if (this.selectCateKeys.length === 3) {
        return this.selectCateKeys[2]
      }
      return null
    },
    // 判断对话框标题
    titleText () {
      if (this.activeName === 'many') return '动态参数'
      else return '静态参数'
    }
  }
}
</script>

<style lang='less' scoped>
.cat_opt {
  margin: 15px 0;
}
.button {
  margin-bottom:15px;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 150px;
}
</style>
